I had a look at Dervock Presbyterian marriage records for you today. (MIC1P/30 in PRONI). I can confirm there is a 4 year gap in the records from March 1841 to March 1845.
Ruth & Archibald’s marriage is not listed, and I didn’t see any other Hazelton or Gardner marriages from 1828 to 1900. The nearest was a Matilda Garner who married in 1889 to Wm Robert Kennedy. Witness was Grace Garner.